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Global Change Master Directory (GCMD)
DRIFTSIM - Development of a User-Friendly Computer Program to Predict Drift Distances of Spray Droplets
Entry ID: USDA_ARS_DRIFTSIM


Summary
Abstract: Computer simulation provides a means of determining the relative effects of various factors on spray drift while field experiments to measure spray drift have the limitation that many variables cannot be controlled. A Windows Version computer program (DRIFTSIM) was developed to rapidly estimate the mean drift distances of water droplets discharged from atomizers on field sprayers. This program interpolates values from a large data base of drift distances originally calculated for single droplets with a flow simulation program (FLUENT). The simulations of drift distances up to 200 m (656 ft) included temperatures (10-30 C; 50-86F), discharge heights (0-2.0 m; 0-6.56 ft), initial downward droplet velocities (0-50 m/s; 0-164 ft/s), relative humidity (10-100%), wind velocities (0-10.0 m/s; 0-32.8 ft/s), droplet sizes (10-2000 m), droplet size distribution in Dv.1, Dv.5 and Dv.9, and 20% turbulence intensity. Variables can be either in metric or English units. For the input of droplet size distribution, drift distances are reported along with portion of volume in each class such as provided by many droplet size analyzers. The accuracy of the program FLUENT was verified with a uniform droplet generator and wind tunnel. The program indicates the relative effects of the input variables on drift distances and should, especially for large droplets, provide reasonable accuracy for many field applications.

[Summary provided by the USDA.]

Related URL
Link: DOWNLOAD SOFTWARE
Description: Download the DRIFTSIM model (registration required).

ISO Topic Category
FARMING
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ECONOMY


Access Constraints
User registration is required before downloading.


Keywords
Models
Crops
Pesticides
Pesticide Dispersion
Spray Drift
Droplet Velocities


Personnel
HEPING ZHU
Role: TECHNICAL CONTACT
Phone: 330-263-3871
Fax: 330-263-3953
Email: Heping.Zhu at ARS.USDA.GOV
Contact Address:
Room 208
1680 MADISON AVE
City: WOOSTER
Province or State: OH
Postal Code: 44691
Country: USA


TYLER B. STEVENS
Role: SERF AUTHOR
Phone: 301-851-8113
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
5700 Rivertech Court
City: Riverdale
Province or State: MD
Postal Code: 20737
Country: USA


Extended Metadata Properties
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Creation and Review Dates
SERF Creation Date: 2012-04-30
SERF Last Revision Date: 2018-09-10



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